So this is my first time posting on here and just need some advise from people who don't know me.. (warning this could be a long one)

So me and my partner have been together for nearly 3 years we live together but no children.. we have been having a rough time lately and aruging.. to start with we do have a really good relationship well most of the time. Recently I'd say past few months have just gone down hill.. he quit his job and then was really down about it so I tired to reassure him that he will sort something and I'm still at work so id be able to look after us until he got something.. however on my birthday which was last week I booked half day and thought we could sort us out because the night before that he was just aruging so much with me and basically said it was over and he couldn't do it anymore.. so I came home on my birthday to find a letter saying he wanted it to be over and it was going to his dad's house.. I rung him and said we need to sort the house etc.. because at this point I was exhausted with all the shit and just thought if it's over then it's over.. he came back got his stuff and went to his dad's house. He started texting me saying we can class it as a break and that he needs to his head out.. baring in mind this was my birthday and he just didn't give a f**k.. my head was just as f**ked but I wanted to talk not leave notes and run off.. he came back the next day acting like nothing had happened and he wanted me back.. I spent my whole birthday crying and very upset! And he just wanted to walk straight back in.. I love him loads I really do.. but I was tired and I just want to be happy.. so I thought I'd give it another shot as he was trying so hard.. and now it's the weekend.. he told me today that he was bored and I was cleaning up so I suggested a few things we could do but everything I said he was like no can't be bothered with that.. then his brothers turn up and he decided he wanted to go up to his dad's instead of just chilling with me.. I'm feeling so shit as I work all week and hardly see him and he was at his dad's all night last night and I didn't moan I just got on with it having a laugh.. I feel like all I'm here for his sex someone he doesn't need to try with just knows I'll be here no matter what.. inside I just want to cry but I'm sick of crying!! In side of me all I keep thinking is that note he left me and I just think if I meant anything to him he would of wanted to talk! And now he's just gone straight back to his old ways within a couple of days! And I just feel like I'd be better off on my own! I don't know who I am anymore I dont feel like myself.. I feel so lost!! 😪😪.. does anyone have any advise? Thank you ☺